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M 150 Tube Documentation

M 150 Tube Awards

Neumann M 150 Tube

Omnidirectional Tube Condenser Microphone

Intended as a modern recreation of the classic spherical-capsule M 50, the M 150 is also a tube mic with a fixed omnidirectional pickup pattern, designed primarily for ambient sound applications.

The M 50 introduced an innovative capsule design — by mounting a small-diaphragm capsule onto the face of a 4cm sphere, the resulting frequency response showed a smoother rise with increasing directionality in the mid-to-high frequencies. The M 150 Tube retains this basic design, but changes all the elements:

The sphere in the M50 was a solid, high-density plexiglass/acrylic compound. The sphere in the M150 is the same size (4cm ø), but is hollow, and is made of a softer plastic compound.

The M50’s capsule (initially and briefly PVC, then aluminum, then Mylar) is replaced here by a titanium capsule, model K 33 TI. As in the M50’s KK50, KK53, and KK83 capsules, the M150’s K 33 TI has an approximate diameter of 12mm. The titanium diaphragm measures 5 microns thick.

Both the diaphragm and housing of the new K33TI capsule are constructed of titanium. Otherwise, the K33TI is identical to the earlier K33 capsule, which used a thinner (~2.5-micron) nickel membrane. For more information, see Martin Schneider’s AES presentation on omnidirectional spherical capsules (sidebar).

The tube in the M150, as in the M147 and M149, is a dual triode model 6111, described by Neumann’s Martin Schneider as “military grade.”

The front grille of the M 150 is sloped, as on numerous other Neumann microphones. This design has the benefit of preventing standing audio waves between the diaphragm and the inside of the grille.

The M 150 Tube mic ships with the external power supply, “8-core” cable (p/n KT 8), suspension shockmount (p/n EA 170), and an aluminum flight case. It is also available in a matched stereo pair kit, with two shockmounts in a large aluminum suitcase.